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ANCHORAGE, Alaska (AP) - The Coast Guard was waiting for daylight Tuesday to see if an Alaska storm had abated enough to allow for flights over a drilling rig that ran aground in shallow water off a small island.

About 250 people from the Coast Guard, Royal Dutch Shell PLC, state responders and others were involved in a response effort and waiting to know for sure what environmental impact the grounding might have caused.

Destin Singleton, a spokeswoman for a unified command center set up at an Anchorage hotel, said if the weather permitted the Coast Guard planned to fly over the Kulluk to assess the drilling rig's condition and determine if it was leaking.

Winds were up to 70 mph, with waves 35 feet and 45-foot swells, she said. "We are doing whatever we can do to prepare," Singleton said.

The Kulluk is carrying 150,000 gallons of diesel and about 12,000 gallons of lube oil and hydraulic fluid. "The condition of the Kulluk has not been confirmed," unified command said in a status report issued about 12 hours after the grounding.

The drilling rig's difficulties go back to Thursday when it separated from a towing vessel south of Kodiak Island as it was being towed to Seattle for maintenance. The rig grounded Monday night on a sand and gravel shore off the southeast side of Sitkalidak Island, an uninhabited island in the Gulf of Alaska.

The North Pacific storm that has caused problems for Shell's efforts to move the drill into place near Kodiak Island was expected to ease a bit Tuesday, said spokeswoman Darci Sinclair.

U.S. Rep. Ed Markey, D-Mass., who is the top Democrat on the Natural Resources Committee, issued a statement Tuesday expressing his concerns about the Kulluk situation.

"Oil companies keep saying they can conquer the Arctic, but the Arctic keeps disagreeing with the oil companies," Markey said. "Drilling expansion could prove disastrous for this sensitive environment."

The Kulluk was being towed Monday by a 360-foot anchor handler, the Aiviq, and a tugboat, the Alert. The vessels were moving north along Kodiak Island, trying to escape the worst of the storm. Sitkalidak is on the southeast side of Kodiak Island.

About 4:15 p.m., the drill ship separated from the Aiviq about 10 to 15 miles off shore and grounding was inevitable, Coast Guard Cmdr. Shane Montoya, the acting federal on-scene coordinator, told reporters.

"Once the Aiviq lost its tow, we knew the Alert could not manage the Kulluk on its own as far as towing, and that's when we started planning for the grounding," he said.

The nine-member tug crew guided the drill ship to a place where it would cause the least environmental damage. The tug cut the unmanned ship loose at 8:15 p.m. and it grounded at 9 p.m.

Susan Childs, Shell's on-scene coordinator, said it was too early to know how the vessel would react to the pounding of the storm when it was aground and stationary. She was optimistic about its salvage prospects and chances for staying intact.

"The unique design of the Kulluk means the diesel fuel tanks are isolated in the center of the vessel and encased in very heavy steel," she said.

The drill ship worked during the short 2012 open water season in the Beaufort Sea off Alaska's north coast.